trying to set up a transparent bridge

[arkantos]

hello,
i have installed CentOS on a physical server.
the mother board has 2 NICs, eno1 and eno2

i am trying to setup a transparent bridge between the 2 NICs.

eno1 is connected to my ISP router (which has DHCP enabled)
eno2 is connected to a switch what has several other computers.

i want the other computers to get their IPs directly from the ISP router.
please guide me - my final aim is to create COMPLETELY transparent cache using Squid and WebMin

thanks
Arkantos.

ps: complete linux noob here